Major 1150 Slurry Vac, Operator'S Manual & Parts List

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Overpressure and Vacuum Adjustment Valves:
The following diagram describes the valves as series (O), on demand (X) and not available (-) for each model of rotary
blades vacuum pump.
ATTENTION: the installation must be always equipped
with depression valve (set at –0,80 bar) and with
overpressure valve (set at 1 bar).
Pressure: the maximum allowed pressure is 2,5 absolute
bar (1,5 relative bar). In order to avoid exceeding this
value or to obtain a lower max pressure, an overpressure
valve, “C”, must be applied that is of a size capable of
discharging the excess air delivery.
Vacuum: too high a vacuum may cause ovality and
waviness of the body or breaking of the blades.
It is therefore advisable to use a vacuum regulator valve,
“D”. These valves may be fitted on the manifold cover
or on manifold of the Rotary blades vacuum pump.
Vacuum working degree is of –0,80 bar.
The regulation of the valves is done by acting on the
throttle placed on the valve same (overpressure valve)
or action on nut and locknut (vacuum adjustment valve).
Testing and Running the Pump
In order to test the Rotary blades vacuum pump check the preceding points, using a workbench if necessary.
Make sure that the P.T.O. shaft turns freely and that the direction of rotation is the same as the one indicated by the
arrow.
If operation of the pump is checked without it being connected to the suction/delivery tubes there will be danger to
operators’ hands due to access to the inside of the discharge elbow. In this situation there is also the danger that foreign
bodies will be sucked into the machine.
Check that the position of the handle is correct and test that the Rotary blades vacuum pump exhausts or compresses.
The running in period foreseen for a rotary blades pump is of 30 of effective working. During that period the working
parameters must be reduced of 20%.